{"id":53021,"date":"2024-12-03T13:13:19","date_gmt":"2024-12-03T05:13:19","guid":{"rendered":"https:\/\/fwq.ai\/blog\/53021\/"},"modified":"2024-12-03T13:13:19","modified_gmt":"2024-12-03T05:13:19","slug":"javascript-%e4%b8%ad-this-%e5%9c%a8%e5%b5%8c%e5%a5%97%e5%87%bd%e6%95%b0%e4%b8%ad%e7%9a%84%e6%8c%87%e5%90%91%e9%97%ae%e9%a2%98%ef%bc%9a%e4%b8%ba%e4%bb%80%e4%b9%88%e5%8c%bf%e5%90%8d%e5%87%bd%e6%95%b0-2","status":"publish","type":"post","link":"https:\/\/fwq.ai\/blog\/53021\/","title":{"rendered":"JavaScript \u4e2d this \u5728\u5d4c\u5957\u51fd\u6570\u4e2d\u7684\u6307\u5411\u95ee\u9898\uff1a\u4e3a\u4ec0\u4e48\u533f\u540d\u51fd\u6570\u4e2d\u7684 this \u6307\u5411 window\uff1f"},"content":{"rendered":"<p><b><\/b>     <\/p>\n<h1>JavaScript \u4e2d this \u5728\u5d4c\u5957\u51fd\u6570\u4e2d\u7684\u6307\u5411\u95ee\u9898\uff1a\u4e3a\u4ec0\u4e48\u533f\u540d\u51fd\u6570\u4e2d\u7684 this \u6307\u5411 window\uff1f<\/h1>\n<p>\u201c\u7eb5\u6709\u75be\u98ce\u6765\uff0c\u4eba\u751f\u4e0d\u8a00\u5f03\u201d\uff0c\u8fd9\u53e5\u8bdd\u9001\u7ed9\u6b63\u5728\u5b66\u4e60<span style=\"color: #FF6600;, Helvetica, Arial, sans-serif;font-size: 14px;background-color: #FFFFFF\">\u6587\u7ae0<\/span>\u7684\u670b\u53cb\u4eec\uff0c\u4e5f\u5e0c\u671b\u5728\u9605\u8bfb\u672c\u6587<span style=\"color: #FF6600;, Helvetica, Arial, sans-serif;font-size: 14px;background-color: #FFFFFF\">\u300aJavaScript \u4e2d this \u5728\u5d4c\u5957\u51fd\u6570\u4e2d\u7684\u6307\u5411\u95ee\u9898\uff1a\u4e3a\u4ec0\u4e48\u533f\u540d\u51fd\u6570\u4e2d\u7684 this \u6307\u5411 window\uff1f\u300b<\/span>\u540e\uff0c\u80fd\u591f\u771f\u7684\u5e2e\u52a9\u5230\u5927\u5bb6\u3002\u6211\u4e5f\u4f1a\u5728\u540e\u7eed\u7684\u6587\u7ae0\u4e2d\uff0c\u9646\u7eed\u66f4\u65b0<span style=\"color: #FF6600;, Helvetica, Arial, sans-serif;font-size: 14px;background-color: #FFFFFF\">\u6587\u7ae0<\/span>\u76f8\u5173\u7684\u6280\u672f\u6587\u7ae0\uff0c\u6709\u597d\u7684\u5efa\u8bae\u6b22\u8fce\u5927\u5bb6\u5728\u8bc4\u8bba\u7559\u8a00\uff0c\u975e\u5e38\u611f\u8c22\uff01<\/p>\n<p><img decoding=\"async\" src=\"https:\/\/www.17golang.com\/uploads\/20241125\/173253406867445f3467151.jpg\" class=\"aligncenter\" title=\"JavaScript \u4e2d this \u5728\u5d4c\u5957\u51fd\u6570\u4e2d\u7684\u6307\u5411\u95ee\u9898\uff1a\u4e3a\u4ec0\u4e48\u533f\u540d\u51fd\u6570\u4e2d\u7684 this \u6307\u5411 window\uff1f\u63d2\u56fe\" alt=\"JavaScript \u4e2d this \u5728\u5d4c\u5957\u51fd\u6570\u4e2d\u7684\u6307\u5411\u95ee\u9898\uff1a\u4e3a\u4ec0\u4e48\u533f\u540d\u51fd\u6570\u4e2d\u7684 this \u6307\u5411 window\uff1f\u63d2\u56fe\" \/><\/p>\n<p><strong>this\u4f5c\u7528\u57df\u95ee\u9898<\/strong><\/p>\n<p>\u5728JavaScript\u4e2d\uff0cthis\u5173\u952e\u5b57\u5f15\u7528\u5f53\u524d\u6267\u884c\u4ee3\u7801\u7684\u5bf9\u8c61\u3002\u5728\u7ed9\u5b9a\u7684\u4ee3\u7801\u793a\u4f8b\u4e2d\uff0c\u51fd\u6570y()\u4f5c\u4e3a\u5bf9\u8c61obj\u7684\u65b9\u6cd5\u88ab\u8c03\u7528\u3002\u4f46\u662f\uff0c\u5728y()\u51fd\u6570\u5185\u90e8\u5b9a\u4e49\u7684\u533f\u540d\u51fd\u6570\u5728\u5168\u5c40\u4e0a\u4e0b\u6587\u4e2d\u6267\u884c\uff0c\u5bfc\u81f4this\u6307\u5411window\u5bf9\u8c61\u800c\u4e0d\u662fobj\u3002<\/p>\n<p>\u7f51\u4e0a\u63d0\u4f9b\u4e86\u4e00\u4e9b\u89e3\u91ca\uff1a<\/p>\n<ul>\n<li>\u77e5\u4e4e\u7528\u6237\u6708\u5915\u6307\u51fa\uff0c\u533f\u540d\u51fd\u6570\u5728\u8be5\u4e0a\u4e0b\u6587\u4e2d\u6ca1\u6709\u7ed1\u5b9a\u5230\u4efb\u4f55\u5bf9\u8c61\uff0c\u4ece\u800c\u5bfc\u81f4this\u6307\u5411window\uff08\u5728\u975e\u4e25\u683c\u6a21\u5f0f\u4e0b\uff09\u3002<\/li>\n<li>\u53e6\u4e00\u4e2a\u89e3\u91ca\u63d0\u5230\u533f\u540d\u5bf9\u8c61\u7684\u6267\u884c\u73af\u5883\u5177\u6709\u5168\u5c40\u6027\uff0c\u56e0\u6b64this\u6307\u5411window\u3002<\/li>\n<\/ul>\n<p>\u56e0\u6b64\uff0cthis.x\u8fd4\u56deundefined\uff0c\u56e0\u4e3a\u5728\u533f\u540d\u51fd\u6570\u6267\u884c\u65f6\uff0cthis\u6307\u5411window\u5bf9\u8c61\uff0c\u800cwindow\u5bf9\u8c61\u6ca1\u6709x\u5c5e\u6027\u3002<\/p>\n<p>\u4ee5\u4e0a\u5c31\u662f\u300aJavaScript \u4e2d this \u5728\u5d4c\u5957\u51fd\u6570\u4e2d\u7684\u6307\u5411\u95ee\u9898\uff1a\u4e3a\u4ec0\u4e48\u533f\u540d\u51fd\u6570\u4e2d\u7684 this \u6307\u5411 window\uff1f\u300b\u7684\u8be6\u7ec6\u5185\u5bb9\uff0c\u66f4\u591a\u5173\u4e8e\u7684\u8d44\u6599\u8bf7\u5173\u6ce8\u7c73\u4e91\u516c\u4f17\u53f7\uff01<\/p>\n<dl>\n<dt><\/dt>\n<dd>\n   \u6768\u6d0b\u7684\u661f\u5ea7\u6768\u6d0b\u7684\u8840\u578b\uff1f\n <\/dd>\n<\/dl>\n","protected":false},"excerpt":{"rendered":"<p>JavaScript \u4e2d this \u5728\u5d4c\u5957\u51fd\u6570\u4e2d\u7684\u6307\u5411\u95ee\u9898\uff1a\u4e3a\u4ec0\u4e48\u533f\u540d\u51fd\u6570\u4e2d\u7684 this \u6307\u5411 window\uff1f \u201c\u7eb5\u6709\u75be\u98ce\u6765\uff0c\u4eba\u751f\u4e0d\u8a00\u5f03\u201d\uff0c\u8fd9\u53e5\u8bdd\u9001\u7ed9\u6b63\u5728\u5b66\u4e60\u6587\u7ae0\u7684\u670b\u53cb\u4eec\uff0c\u4e5f\u5e0c\u671b\u5728\u9605\u8bfb\u672c\u6587\u300aJavaScript \u4e2d this \u5728\u5d4c\u5957\u51fd\u6570\u4e2d\u7684\u6307\u5411\u95ee\u9898\uff1a\u4e3a\u4ec0\u4e48\u533f\u540d\u51fd\u6570\u4e2d\u7684 this \u6307\u5411 window\uff1f\u300b\u540e\uff0c\u80fd\u591f\u771f\u7684\u5e2e\u52a9\u5230\u5927\u5bb6\u3002\u6211\u4e5f\u4f1a\u5728\u540e\u7eed\u7684\u6587\u7ae0\u4e2d\uff0c\u9646\u7eed\u66f4\u65b0\u6587\u7ae0\u76f8\u5173\u7684\u6280\u672f\u6587\u7ae0\uff0c\u6709\u597d\u7684\u5efa\u8bae\u6b22\u8fce\u5927\u5bb6\u5728\u8bc4\u8bba\u7559\u8a00\uff0c\u975e\u5e38\u611f\u8c22\uff01 this\u4f5c\u7528\u57df\u95ee\u9898 \u5728JavaScript\u4e2d\uff0cthis\u5173\u952e\u5b57\u5f15\u7528\u5f53\u524d\u6267\u884c\u4ee3\u7801\u7684\u5bf9\u8c61\u3002\u5728\u7ed9\u5b9a\u7684\u4ee3\u7801\u793a\u4f8b\u4e2d\uff0c\u51fd\u6570y()\u4f5c\u4e3a\u5bf9\u8c61obj\u7684\u65b9\u6cd5\u88ab\u8c03\u7528\u3002\u4f46\u662f\uff0c\u5728y()\u51fd\u6570\u5185\u90e8\u5b9a\u4e49\u7684\u533f\u540d\u51fd\u6570\u5728\u5168\u5c40\u4e0a\u4e0b\u6587\u4e2d\u6267\u884c\uff0c\u5bfc\u81f4this\u6307\u5411window\u5bf9\u8c61\u800c\u4e0d\u662fobj\u3002 \u7f51\u4e0a\u63d0\u4f9b\u4e86\u4e00\u4e9b\u89e3\u91ca\uff1a \u77e5\u4e4e\u7528\u6237\u6708\u5915\u6307\u51fa\uff0c\u533f\u540d\u51fd\u6570\u5728\u8be5\u4e0a\u4e0b\u6587\u4e2d\u6ca1\u6709\u7ed1\u5b9a\u5230\u4efb\u4f55\u5bf9\u8c61\uff0c\u4ece\u800c\u5bfc\u81f4this\u6307\u5411window\uff08\u5728\u975e\u4e25\u683c\u6a21\u5f0f\u4e0b\uff09\u3002 \u53e6\u4e00\u4e2a\u89e3\u91ca\u63d0\u5230\u533f\u540d\u5bf9\u8c61\u7684\u6267\u884c\u73af\u5883\u5177\u6709\u5168\u5c40\u6027\uff0c\u56e0\u6b64this\u6307\u5411window\u3002 \u56e0\u6b64\uff0cthis.x\u8fd4\u56deundefined\uff0c\u56e0\u4e3a\u5728\u533f\u540d\u51fd\u6570\u6267\u884c\u65f6\uff0cthis\u6307\u5411window\u5bf9\u8c61\uff0c\u800cwindow\u5bf9\u8c61\u6ca1\u6709x\u5c5e\u6027\u3002 \u4ee5\u4e0a\u5c31\u662f\u300aJavaScript \u4e2d this \u5728\u5d4c\u5957\u51fd\u6570\u4e2d\u7684\u6307\u5411\u95ee\u9898\uff1a\u4e3a\u4ec0\u4e48\u533f\u540d\u51fd\u6570\u4e2d\u7684 this \u6307\u5411 window\uff1f\u300b\u7684\u8be6\u7ec6\u5185\u5bb9\uff0c\u66f4\u591a\u5173\u4e8e\u7684\u8d44\u6599\u8bf7\u5173\u6ce8\u7c73\u4e91\u516c\u4f17\u53f7\uff01 \u6768\u6d0b\u7684\u661f\u5ea7\u6768\u6d0b\u7684\u8840\u578b\uff1f<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"closed","ping_status":"","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[16],"tags":[],"class_list":["post-53021","post","type-post","status-publish","format-standard","hentry","category-16"],"_links":{"self":[{"href":"https:\/\/fwq.ai\/blog\/wp-json\/wp\/v2\/posts\/53021","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/fwq.ai\/blog\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/fwq.ai\/blog\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/fwq.ai\/blog\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/fwq.ai\/blog\/wp-json\/wp\/v2\/comments?post=53021"}],"version-history":[{"count":0,"href":"https:\/\/fwq.ai\/blog\/wp-json\/wp\/v2\/posts\/53021\/revisions"}],"wp:attachment":[{"href":"https:\/\/fwq.ai\/blog\/wp-json\/wp\/v2\/media?parent=53021"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/fwq.ai\/blog\/wp-json\/wp\/v2\/categories?post=53021"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/fwq.ai\/blog\/wp-json\/wp\/v2\/tags?post=53021"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}